Loud speaker



G. A. GILLEN LOUD SPEAKER Filed March 9, 1925 INVENTOR George A. Gillan;-

' ATTORNEY Patented Get. 5, 192%.

GEORGE A. GILLEN, OF JERSEY C1 TY, JERSEY, AS SIGNOR TOGILLEN, BAKER, SYNDICATE, INCORPORATED, O

I Kir/rr/rnr, s NEW YORK, 1a. Y., a-ooiaronn'rron- LOUD SPEAKER.

Application filed. March 9, 1925. Serial No. 13,981.

This invention relates to loud speaking telephone receivers such as are commonly used in receiving broadcast programs and the'like. The principal object of the invention is scribed wherein the diaphragm to provide a speaker of the class deis mounted between the pole pieces of the magnet in such a manner that its action is cushioned, thereby increasing the quality ot'reception and reducing the rattiing and raspin com monly experienced in the use of the ordinary loud speaker, to a minimum.

Another object of the invention resides in the provision of an adjustable loud speaker so that it may be readily varied and ad nted to the pecularities of the receiving set in connection with which it is used A further object of the invention is to provide a magnetic upon by magnetic pieces of armature which is acted the variations of the density or the flux flowing between the pole the permanent magnet and which is anchored to a diaphragm or" any suitable substance either of amagnetic or non-magnetic substance.

With the above and other objects in View, the invention consists in the novel construction, combination and arran ement of parts which will be fully set forth in the following specification, claimed and illustrated in the accompanying drawing in which Fig. 1 is a top plan view of this improved loud speaker.

Fig. 2 is avertical sectional View taken on 7 line 2-2 of Fig. 1.

Fig. 3 is a similar view taken on line 33 of ri 1.

Fig. 1 is a perspective view of the magnet, showing fragments of the ad usting screws, and

Fig. 5 is a perspective View of the armature mounting block.

Referring to the drawings in detail, the

numeral designates in its entirety the housing and diaphragm support prises a pair hers 11 and meetlng edges with annular tending flanges 13 and 14: respectively,

which cor or" hollow semi-spherical mem- 12 which are provided at their outwardly eX- and the inwardly extending diaphragm supporting ges 15 and 16. The dlaphragm 17 is secured between a pair of annular cushioning rings 18 which in turn are clamped rings 19 by means of clampin between the clamping g screws 21 form a recess for the reception of the head,

' ings 36 which act as guides for which enter the flanges 15 to secure the diaphragm in place as clearly shown in. the drawings. Formed centrally of the diaphragm isa boss 22 which is upstruck'to :60 of a screw 23 and also a bearing for the end of the armature 2 L. It will thus be seen that a rigid connection between the armature and diaphragm is in thismanner obtained.

The end of the armature opposite that which is secured to the diaphragm is pivoted as at 25 ina block 26 which is secured to the flange 13 previously described. 1

Secured tothe inner tacefof. the lower member 11 is a horse-shoe. shaped permanent magnet 27 the pole pieces 28 of which are cut away to provide fiat faces 29 to which the flattened portions 30 of the cores of themagnets 31 are secured as will' be clearly seen upon reference to Figs. These flattened portions 30 are pierced as at'32; to receive the tapered portions of adjusting screws, to. be

I more fully'hereinatter described. As shown at 33 at the bightportion t0. permit of a moderate flexing-oft the same sothat the pole pieces-31 may be readily adjusted toward or away irom the armature 2 1 i In order to provide a positive and secure adjustment of the magnet, the members 11 and 12 are provided with diametrically opposed tubular bosses 34: and 35, the axes of which are arranged at right angles to the longitudinal axis of the magnet 27 and substantially in alignment with the openings 32 previously mentioned. These bosses 341 and 35 are internally screw threaded and the bosses on one side are provided with bushthe reduced stems 37 formed on the inner ends of the adjusting screws '38. As shown the reduced stem 37 of each screw 38 is joined thereto by a a collar 42 formed on a suitable base 43 so that the device may be supported in an upright position.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

l/Vhat is claimed is:

l. A loud. speaking receiver comprising a diaphragm, a permanent horse-shoe magnet, means supporting the diaphragm between the poles of said magnet, pole pieces secured to the poles of the magnet and extending into close proximity to the dia- *phragm, and adjusting screws for moving the pole pieces away from the diaphragm against the spring tension of the magnet.

2. A loud speaking receiver comprising a diaphragm, a permanent horse-shoe magnet, means supporting the diaphragm between the poles of said magnet, pole pieces secured to the poles of the magnet and being disposed in close proximity to the diaphragm on opposite sides thereof, pierced extensions on said pole pieces, and adjusting screws eX- tending therethrough whereby the distance between the pole pieces and the diaphragm may be varied.

3. A loud speaking receiver comprising a diaphragm, a permanent horse-shoe magnet, means supporting the diaphragm between the poles of said magnet, pole pieces on the poles of said magnet extending into close proximity to the diaphragm, apertured extensions on the pole pieces, adjusting screws, and tapered extensions on said adjusting screws adapted to enter the apertures in the pole pieces whereby when the screws are advanced, the pole pieces will be moved against the tension of the magnet away from the diaphragm.

t. A loud speaking receiver comprising a diaphragm, a permanent horse-shoe magnet, means supporting the diaphragm between the poles of said magnet, pole pieces secured to the poles of the magnet and being disposed in close proximity to the diaphragm on opposi e sides thereof, pierced extensions on said pole pieces, and adjusting screws extending therethrough whereby the distance between t.e pole pieces and the diaphragm ma 1 be varied and an armature secured to the diaphragm in al'gnmcnt with the pole pieces.

A loud speaking receivercomprising a diaphragm, a permanent horse-shoe magnet, means supporting the diaphragm between the poles or said magnet, pole aieces on the poles of said magnet extending into close proximity to the diaphragm, apertured eX- tensions on the pole pieces, adjusting screws, and tapered extensions on said adjusting screws adapted to enter the apertures in the pole pieces whereby when the screws are advanced, the pole pieces will be moved against tae tension of the magnet away from the diaphragm and an armature secured to the diaphragm in alignment with the pole pieces.

GEORGE GILLEN. 

